The red button is for "auto tune", used to return the meter to zero when it drifts. It is first set to zero with the coil in mid-air, using the Tune control.
There is a built- in speaker but plugging in headphones will let you hear more clearly in noisy environments. It's more useful that way.
SOURCE: Need manual for Radio Shack MICRONTA 63-3003 VLF Metal Detector
Go to http://www.scribd.com/doc/38611721/63-3003-Micronta-VLF-Metal-Detector-Manual
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SOURCE: Hi my micronta 4003 has only three wires in the
I have one of those. It takes THREE nine volt batteries. IF it does not have the connectors for three batteries, then it has either been modified or damaged.
SOURCE: my micronta 4003 metal detector has only three
From the picture, it looks like it takes (3) 9-volt batteries, NEDA 1604 type.
Good luck hunting!
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